- 1). Plant gladiolus corms after the risk of frost has passed. Choose a spot in the garden that gets direct sunlight for at least six hours each day.
- 2). Loosen the soil of your planting area to a depth of at least 10 inches, using a garden fork or hoe.
Dig holes for your gladiolus corms 4 to 6 inches deep in the loosened soil. Space the holes at least four inches apart. - 3). Add mulch when covering up the corms with your soil.
- 4). Water once the gladiolus corms are planted; thereafter, they should not need watering during the spring, except during particularly dry conditions.
- 5). Water regularly as soon as foliage appears in the late spring or early summer.
- 6). Remove weeds from around short gladioluses to make sure they get enough sunlight. Add mulch between plants to keep moisture in the soil.
- 7). Remove any dead blossoms and carry on watering into the summer.
- 8). Trim the stalks down to 4 inches at the end of summer, to let the corms get precious nutrients. In colder temperatures, remove the corms and store them at a temperature of 35 to 45 degrees in a well-ventilated area; they can be replanted in the spring. In milder areas, leave them in the ground and add mulch on top.
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